diff --git a/app/views/journals/diff.html.erb b/app/views/journals/diff.html.erb
index 190459b71..7768f0833 100644
--- a/app/views/journals/diff.html.erb
+++ b/app/views/journals/diff.html.erb
@@ -1,7 +1,7 @@
 <h3><%=h @issue.tracker %> #<%= @issue.id %></h3>
 <p>由<%= @journal.user %> 更新于 <%= format_time @journal.created_on %></p>
 
-<div class="text-diff">
+<div class="text-diff" style="word-break:break-all; word-wrap:break-word;">
   <%= simple_format_without_paragraph @diff.to_html %>
 </div>